feat(config): implement configs and from_config() for CrewaiTool and LangchainTool

PiperOrigin-RevId: 791742964

Author: wuliang229

src/google/adk/tools/crewai_tool.py

@@ -18,6 +18,8 @@
 from typing_extensions import override
 
 from . import _automatic_function_calling_util
+from .base_tool import BaseToolConfig
+from .base_tool import ToolArgsConfig
 from .function_tool import FunctionTool
 
 try:
@@ -70,3 +72,29 @@ def _get_declaration(self) -> types.FunctionDeclaration:
         self.tool.args_schema.model_json_schema(),
     )
     return function_declaration
+
+  @override
+  @classmethod
+  def from_config(
+      cls: type[CrewaiTool], config: ToolArgsConfig, config_abs_path: str
+  ) -> CrewaiTool:
+    from ..agents import config_agent_utils
+
+    crewai_tool_config = CrewaiToolConfig.model_validate(config.model_dump())
+    tool = config_agent_utils.resolve_fully_qualified_name(
+        crewai_tool_config.tool
+    )
+    name = crewai_tool_config.name
+    description = crewai_tool_config.description
+    return cls(tool, name=name, description=description)
+
+
+class CrewaiToolConfig(BaseToolConfig):
+  tool: str
+  """The fully qualified path of the CrewAI tool instance."""
+
+  name: str = ""
+  """The name of the tool."""
+
+  description: str = ""
+  """The description of the tool."""

src/google/adk/tools/langchain_tool.py

@@ -19,11 +19,13 @@
 
 from google.genai import types
 from langchain.agents import Tool
-from langchain_core.tools import BaseTool
+from langchain_core.tools import BaseTool as LangchainBaseTool
 from langchain_core.tools.structured import StructuredTool
 from typing_extensions import override
 
 from . import _automatic_function_calling_util
+from .base_tool import BaseToolConfig
+from .base_tool import ToolArgsConfig
 from .function_tool import FunctionTool
 
 
@@ -50,12 +52,12 @@ class LangchainTool(FunctionTool):
       wrapped_tool = LangchainTool(search_tool)
   """
 
-  _langchain_tool: Union[BaseTool, object]
+  _langchain_tool: Union[LangchainBaseTool, object]
   """The wrapped langchain tool."""
 
   def __init__(
       self,
-      tool: Union[BaseTool, object],
+      tool: Union[LangchainBaseTool, object],
       name: Optional[str] = None,
       description: Optional[str] = None,
   ):
@@ -114,7 +116,7 @@ def _get_declaration(self) -> types.FunctionDeclaration:
       # 2. Other tools: the tool doesn't inherit any class but follow some
       #    conventions, like having a "run" method.
       # Handle BaseTool type (preferred Langchain approach)
-      if isinstance(self._langchain_tool, BaseTool):
+      if isinstance(self._langchain_tool, LangchainBaseTool):
         tool_wrapper = Tool(
             name=self.name,
             func=self.func,
@@ -148,3 +150,31 @@ def _get_declaration(self) -> types.FunctionDeclaration:
       raise ValueError(
           f'Failed to build function declaration for Langchain tool: {e}'
       ) from e
+
+  @override
+  @classmethod
+  def from_config(
+      cls: type[LangchainTool], config: ToolArgsConfig, config_abs_path: str
+  ) -> LangchainTool:
+    from ..agents import config_agent_utils
+
+    langchain_tool_config = LangchainToolConfig.model_validate(
+        config.model_dump()
+    )
+    tool = config_agent_utils.resolve_fully_qualified_name(
+        langchain_tool_config.tool
+    )
+    name = langchain_tool_config.name
+    description = langchain_tool_config.description
+    return cls(tool, name=name, description=description)
+
+
+class LangchainToolConfig(BaseToolConfig):
+  tool: str
+  """The fully qualified path of the Langchain tool instance."""
+
+  name: str = ''
+  """The name of the tool."""
+
+  description: str = ''
+  """The description of the tool."""